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Guess what: my logs NEVER show any user using this keyword combo on any SE.
So, if OT claims 5k times the keyword combo is used, I would assume the entire web community would use that combo more often (factor 2?) across all SE's (my site is indexed by all majors). Why the heck do I not get ANY request via Google (I get nice traffic via G) with that keyword combo. I can't believe that particular combo is not used by G users. Maybe it's not used at all?
What's wrong about OT, how can I trust them ever again?
Stemming and other matching can really skew these numbers along with other things (that I'm not sure of). Use word tracker and google to double check expected search volumes.
Also another quick test is to buy the phrase with overture and adwords. If you receive traffic, you should look further. It does not guarantee that the search phrase is good because as previously stated they could be using stemming and matching.